anyway, I found a solution and tought I'd better share it:
Code: Select all
\boldsymbol{J}_{\hspace*{-0.5ex}\boldsymbol{F}\hspace*{-0.2ex}I\hspace*{-0.4ex}I}
Code: Select all
\boldsymbol{J}_{\hspace*{-0.5ex}\boldsymbol{F}\hspace*{-0.2ex}I\hspace*{-0.4ex}I}
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